Holy geez -- I dremeled the crap out of an old Opinel. First I used the aluminum oxide grinder bit to take off most of the rust that was encrusting the back of the blade. Then I added some filework to the back of the blade, something like on a Cold Steel Culloden. The thing I learned from that is that I should have marked where I was going to cut first. I used a cut off wheel to do that. Then I used the cut-off wheel to widen the nail-nick, and put it all the way through the blade. After that, I ground a false edge on the tip, just for s--ts and giggles, put a mirror finish on the blade, and changed the blade shape to a recurve. Whew! Dremels are fun!